Average speed question help?

Question

A vehicle joins a motorway and travels at a steady speed pf 25 m s-1 for 30 mins then it travels a further distance of 40 km in 20 min before leaving the motorway.

Calculate its average speed on the motorway.

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General Physics RvTDLR 4 years 1 Answer 525 views 0

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Answer ( 1 )

  1. 25 m/sec = 25*3.6 = 90 km/h
    90 km/h*0.5 h = 45 km
    total distance d = 45+40 = 85 km
    total time t = 1/2+1/3 = 5/6 of hour
    average speed = d/t = 85*6/5 = 102 km/h

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